Insidious: The Last Key is the sequel to Insidious: Chapter 3 and a prequel to Insidious and Insidious: Chapter 2. That should be confusing, but these movies are ultimately about one thing and one thing only: scaring the crap right out of you. As long as they get that done, audiences will probably forgive a somewhat chaotic chronology.

The new Insidious: The Last Key trailer is here and it delivers what you’d expect from an Insidious movie: people slowly walking around dark rooms before something with an awful face appears suddenly. By now, you probably know if these movies are for you or not.

The Insidious franchise may have begun with Patrick Wilson and Rose Byrne dealing with a demon in their home, but everyone quickly realized that demonologist Elise Reiner and her technologically proficient sidekicks Specs and Tucker were the real stars of the show. So how do you deal with the fact that Elise didn’t survive the events of the first film? Simple: you make the sequels into prequels.

Following in the footsteps of 2015’s Insidious: Chapter 3, the fourth film in the series takes place before the events of the first movie, bringing the great Lin Shaye back into the fold for another supernatural adventure. The first Insidious: The Last Key trailer is here and the lack of a number in the title is telling – the series is breaking free from the first few entries and is looking to chart a new course.